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Author Topic: Parallel Plate Capacitor Fringing  (Read 20802 times)
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tommyers
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on: June 17, 2006, 04:16:00 am »

Hi,

I am experimenting with a simple Parallel Plate Capacitor arrangement in order to measure the dielectric of the material between the plates - air, 1 and polycarbonate, 2.9 at this stage. I would eventually like to further this technique to a fringing sensor arrangment, but first I need the following issues resolving.

The plate separation is significant compared with the plate area i.e plate area, A = 1586mm^2 and the plate separation, d = 9.8mm. Using the elementary capacitor equation, C = (Eo x Er x A)/d does not include the fringing effect caused by such A/d ratio. Therefore my measurements are out with my calculations, in some cases by 40%.

I would like a method of modelling the fringing effect so I may gauge the total capacitance in theory, and therefore the resulting dielectric, before carrying out the experiment.

I have looked at many methods including the Boundary element method and such like. I would appretiate if someone could guide me through the modeling process either by example or recommendation of websites / texts / tutorials or books.

Ultimately it would be nice to carry out such calculations and simulations using software so any recommendations using this would also be useful.

I look forward to hearing your thoughts and comments.

Regards

Tom Myers
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Fu-Kwun Hwang
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Reply #1 on: June 19, 2006, 12:01:23 pm » posted from:Taipei,T'ai-pei,Taiwan

It can be simulated with numerical method: put laplace/posisson equstion into numerical form.
You can check out standard textbook about numerical method.
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tommyers
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Reply #2 on: June 19, 2006, 03:31:51 pm »

Hi,

Could you please be more specific and maybe provide examples or references to textbooks.

Regards

Tom
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EduZer
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Reply #3 on: June 12, 2009, 10:07:14 am » posted from:San Juan,Batangas,Philippines

   Yeah can you give some examples or any reference textbook.,I really want to know it..,




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Fu-Kwun Hwang
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Reply #4 on: June 12, 2009, 02:21:07 pm » posted from:Taipei,T\'ai-pei,Taiwan

For example:  Numerical recipes Home page at http://www.nr.com/
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